/Engine/Source/Editor/BehaviorTreeEditor/Classes/EdGraphSchema_BehaviorTree.h
Determine if two nodes can be merged
An empty string if the merge is legal, otherwise a message describing why the merge would fail.
virtual const [FPinConnectionResponse](API\Runtime\Engine\EdGraph\FPinConnectionResponse) CanMergeNodes ( const [UEdGraphNode](API\Runtime\Engine\EdGraph\UEdGraphNode) * A, const [UEdGraphNode](API\Runtime\Engine\EdGraph\UEdGraphNode) * B ) const